Improvement in pin-sticking machines for key-boards



s Sheets-Sheetl. C. W. PRATT.

PINv-STICKING MACHINES FOR KEYBOARDS. No.18 Z,705. Patented Sept.26,1876.

qlllm MPETEHS, PHUTO-LITHOGRAPHER. WASHINGTON, D c.

3 Sheets-Sheet Z.

0. W. PRATT. PIN-STICKING MACHINE 182,705.

S. FOR KEYBOARDS.

Patented Sept. 26,1876.

3 Sheets$hee 3.

C. W. PRATT. PIN-STICKING MACHINES F No. 182,705.

0R KEYBOARDS.

Patented Sept. 26, 1876.

W ITN ESSES ".FETEws, PHoTo-LlTHoGRAfMER, WASHINGTONv D. C.

CHARLES W. PRATT, on DEEP RIVER, CONNECTICUT READ & Co., CESAME PL CE.

IMPROVEMENT IN PliN-STICKlNG MACHINES FOR KEV-BOARDS.

Specification forming 5m of Letters Patent No. 152,705 dated September26, 1876; application filed March 20, 1876. I

To all whom it may concern Be it known that I, CHARLES W. PRATT, of DeepRiver, in the county of Middlesex and State of Connecticut, haveinvented certain new and useful'Improvements pertaining to a Machine forSticking Pins in Key-Boards for Musical Instruments, of which thefollowing is a specification, reference being had to the accompanyingdrawings, where- Figure 1 is a top view. Fig. 2 is a front view. Fig. 3is a sectional elevation on the plane .22 00, looking in the directiondenoted by the arrow :10. Fig. 4. is a sectional elevation on the planea as, looking in the opposite direction from that indicated by the arrowas. Fig. 5 is an end elevation of the left end.

In the manufacture of key-boards for pianos, melodeons, and organs, itis requisite that a row or rows of pinsgenerally of brass-be driven intoa part of the wooden frame-work as guides and pivots for the keys. Thisma-, chine is intended for driving such pins.

The letter (t denotes the table of the machine; B, a wooden strip, intowhich a row of pins is being driven c, an arched arm rising from thetable, and d a spring-finger hung thereto upon pin 6 and screw-pin f,pressing upon the strip B, its pressure regulated by thumb-nut g; andbifurcated by the mortise h for the passage of the driven pins, and toguide the longitudinal motion of the wooden strip. The pins are fed, byhand or by appropriate mechanism, into holes 'i in the rotarycarrier-disk j, and are held from accidentally escaping by springs 70bearing upon pins Z, which, in turn, bear against the pins m after theyare in the holes 72. This carrier-disk is hung in or to thevertically-reciproeating slide 41., which, in turn, is hung by Ways onthe standard 0, and has vertical reciprocation given it by the eccentric10 on shaft 1' through the medium of strap 8 and pitman T, so that thecarrier-disk has an up-and-down motion at proper intervals, descendingto drive a pin in the. wooden strip, and then rising to permit the feedmotion of the wooden strip. The carrier-disk has proper step-by-Steprotation given to it through the medium of the camslot a, pin 0;, diskto, and pawl y, acting on the ratchet 2, which is fast with thecarrier-disk. Disk 20 is loose on the shaft of the carrier-disk.

The step-by-step feed motion of the strip 12 is given by means asfollows: The letter d denotes a slide moving in ways 6, carrying the armfpressed down by spring g--carrying the finger h, which engages, ashereinafter described, with the pin-holes in the wooden strip. The arm fis fast on the top of vertical rod 6, running down through the sleeve j,which is fast on the bottom of slide d, and it (the rod i) has at itsfoot the lateral spur or arm is.

The proper up and down motions of the rod t" and arm f are given by thecam Z. Their proper lateral motions are given by the two French cams mand a. All three of these cams are on the shaft 1". 1 will describethese motions, commencing at the position given to the feed-finger h inFig. 2. At this point the finger h has fallen into one of the pinholesin the wooden strip. The cam n, striking the side-of rod 1', moves it(and with it slide cl, arm f, and finger it) toward the carrier-disktill the feed-finger h is directly under the carrier-disk; then the caml strikes the bottom of arm k and raises the finger h out of thepin-hole. While thus raised, and before the arm is has dropped off theshoulder of cam 5, French cam m strikes the end of arm 70 and movesfinger it back, (to the right in Fig. 2,) and just after this backwardlateral motion has commenced arm it drops off shoulder of cam Z andfinger h drops upon the surface of strip B. The backward lateral motionof finger It continues till it finds a fresh pin-hole, into which itdrops, letting arm 7t drop below the French cam m, thus stopping thebackward lateral motion. This brings the finger h to the position shownin Fig. 2, which is the point at which I commenced the description ofthe motions of this feed-finger.

It would seem, at first glance, that some simple feed motion which wouldmove the strip B the same distance each time would answer; but it is notso, for the pins vary in distance apart.

I claim as my invention- 1. The combination of rotating carrier-disk,ASSieNoR To PRATT,

j, having pin-holes-i and springs 70, with pins l, all-substantially asdescribed.

2. The combination of rotating carrier-disk j with slide a, standard 0,disk 20, pawl y, and ratchet 2, all substantially as described.

3. In a pin-sticking machine for musical instruments and otherkey-boards, the combination of table a with bifurcated pressure-tingerd, all substantially described.

4. The combination of slide 01 with reciproeating arm f and finger 71/,all substantially as described.

5. The combination of rod 0" with cam l and French cams m n, allsubstantially'as described.

6. The combination of French cams m n and cam l with rod 2', slide d,arm f, and

finger h, all substantially as described.

7. The combination of carrier-disk slide n, and pitman T with eccentricp, shaft 7', cams l m a, rod 11, arm f, and slide d, substantially asdescribed.

CHAS. W.-PRATT.

Witnesses:

LOUIs P. PARKER, GIDEON PARKER.

